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No sound after upgrade to Windows 7.

In 2005, I bought a Dell Dimension 8400 desktop with 3.40GHz Pentium 4 CPU, 64 bit technology, and Windows XP Professional. I upgraded memory to 4GB. The 250GB Hard disk failed, so Dell techs suggested I replace with 500GB and upgrade to Windows 7, assuring me that these would be compatible with my system. Everything is working well EXCEPT I have no sound. I get a pop-up msg that sound card is not compatible with Windows 7. In a chat with Dell, tech suggested a Creative Soundblaster card that would be compatible with Windows 7; however, the Amazon merchant advised that that soundcard was not compatible with Pentium 4. So should I get a new processor as well as a new sound card? I like this computer but am ignorant about hardware. I am not into gaming or programming. Will appreciate any suggestions to solve this no-sound problem

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All Answers

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Answer
Try a usb audio adapter first for...

In reply to: No sound after upgrade to Windows 7.

under $10. reason no sound for win7 is because there's no driver for 7. and what none sense about the sound card and pentium 4?

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Answer
No sound after upgrade to Windows 7.

In reply to: No sound after upgrade to Windows 7.

How to Fix a "No Audio Output Device Is Installed" Message on a Computer?
Instructions:
1. Double-check the source of the problem by typing "Win" and "R" to open the Run box. Type "dxdiag" into the box and click "OK." When you're asked if you want to allow the DX Diagnostics program to load, click "Yes."

2. Click on the "Sound" tab. If your sound card's device drivers have indeed been "bumped off," you won't see any entry under "Name." Instead, the entry will say "No device loaded." If you do see that a device is loaded, click on "Test DirectSound." If the diagnostic tester is playing sounds but you still don't hear anything, it may be that your speakers are turned off, unplugged or broken, and there may be nothing wrong with your device driver at all. Otherwise, click on "Exit" to continue with this repair.

3. Relocate your sound card device driver. If you have a recovery disc that came with your computer, the device driver file is located on this disc. Most laptop or desktop computer manufacturers use sound drivers from SoundMAX, Creative or RealTEK, so look for those files on the recovery disc. Copy the files to your computer. If you don't have a recovery disc, check your sound card manufacturer's website for the latest drivers. Download them to your computer directly.

4. Click on the fresh sound card device driver "Install" or "Set Up" icon on your hard drive. Follow the steps to install the new driver. Reboot your machine so the drivers can take effect if prompted to do so by the setup routine. Make sure you have your speakers plugged in and turned on as you install the drivers and reboot.

5. Navigate back to DX Diagnostics screen and check the "Sound" tab again. You should see your sound card listed now. Click on "Test DirectSound" and step through the various tests. If your sound card now passes, click on "Exit."

6. Click on the "More Help" tab if you still don't hear sound coming from known-good speakers. Windows walks you through a few more tests to determine what could be wrong with your system.
http://windows.microsoft.com/en-us/windows/no-sound-help#no-sound=windows-7&v1h=win8tab1&v2h=win7tab1&v3h=winvistatab1&v4h=winxptab1

Unnecessary link to driver download site deleted by moderator

Post was last edited on June 9, 2015 1:00 AM PDT

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